Radio direction finder



FIG. 1 is a front perspective view of a radio direction finder showingmy new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof.

The ornamental design for a radio direction finder, as shown anddescribed.